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Finding the Fourth Proportional to 681.52, 1,021.68 and 316.12

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Solution

The fourth proportional to 681.52, 1,021.68 and 316.12 is: 473.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.52 : 1,021.68 = 316.12 : x
  2. Step 2: Convert to fraction form
    681.52/1,021.68 = 316.12/x
  3. Step 3: Cross multiply
    681.52x = 1,021.68 × 316.12
  4. Step 4: Simplify right side
    681.52x = 322,973.48
  5. Step 5: Solve for x
    x = 322,973.48/681.52
  6. Step 6: Final answer
    x = 473.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.